Wesenberg Castle is a medieval motte-and-bailey castle. Of the original castle, only the bergfried tower and an adjacent part of the former ring wall survives. The castle was founded by Nicholas I of Werle during the middle of the 13th century, as protection for the city of Wesenberg. Among other things, the castle served as a residence for the widow of Duke Ulrich II of Mecklenburg-Stargard, Catherine. The castle was largely destroyed by a fire in 1630. Today, the castle is owned by the city of Wesenberg and since 1950 it houses the offices of the local forestry administration.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.